In-situ X-ray Absorption Spectroelectrochemistry for Determination of the Oxidation States and the Local Structure of Metalloprotein Model Compounds

Toshio Yamaguchi; Mats Valli; Seiya Miyata; Hisanobu Wakita

doi:10.2116/analsci.13.Supplement_37

Toshio Yamaguchi, Mats Valli, Seiya Miyata, Hisanobu Wakita

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Keywords: XANES, EXAFS, in-situ electrochemical cell, Photosystem II, hemerythrin

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1997 Volume 13 Issue Supplement Pages 37-40

DOI https://doi.org/10.2116/analsci.13.Supplement_37

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Published: 1997 Received: - Available on J-STAGE: July 07, 2006 Accepted: - Advance online publication: - Revised: -
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Date of correction: July 07, 2006 Reason for correction: - Correction: ABSTRACT Details: Wrong : X-ray absorption spectroscopy combined with an in-situ electrochemical cell has been developed for characterization of unstable, but electrochemically stable metalloprotein model compounds with various oxidation states in solution. The technique has been applied to some dimanganese Schiff-base complexes
Right : X-ray absorption spectroscopy combined with an in-situ electrochemical cell has been developed for characterization of unstable, but electrochemically stable metalloprotein model compounds with various oxidation states in solution. The technique has been applied to some dimanganese Schiff-base complexes as a model of Photosystem II and [Ru₂(μ-O)(μ-CH₃COO)₂(bpy)₂L₂](L=pyridine and 1-methylimidazole) as a model off hemerythrin. It has been found that X-ray absorption near-edge structure (XANES) patterns correlate well with the formal oxidation states of the metal ions and aggregation. The analysis of extended X-ray absorption fine structure (EXAFS) data has revealed characteristic metal-ligand and metal-metal distances within the model compounds with different oxidation states.

Date of correction: July 07, 2006 Reason for correction: - Correction: AUTHOR Details: Wrong : Toshio Yamaguchi²⁾, Mats Valli¹⁾, Seiya Miyata¹⁾, Hisanobu Wakita¹⁾
Right : Toshio Yamaguchi¹⁾, Mats Valli¹⁾, Seiya Miyata¹⁾, Hisanobu Wakita¹⁾

Date of correction: July 07, 2006 Reason for correction: - Correction: PDF FILE Details: -

Abstract

X-ray absorption spectroscopy combined with an in-situ electrochemical cell has been developed for characterization of unstable, but electrochemically stable metalloprotein model compounds with various oxidation states in solution. The technique has been applied to some dimanganese Schiff-base complexes as a model of Photosystem II and [Ru₂(μ-O)(μ-CH₃COO)₂(bpy)₂L₂](L=pyridine and 1-methylimidazole) as a model off hemerythrin. It has been found that X-ray absorption near-edge structure (XANES) patterns correlate well with the formal oxidation states of the metal ions and aggregation. The analysis of extended X-ray absorption fine structure (EXAFS) data has revealed characteristic metal-ligand and metal-metal distances within the model compounds with different oxidation states.

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